Graig Wood is a Site of Special Scientific Interest (SSSI), noted for its biological characteristics, in Monmouthshire, south east Wales.

The 14.3-hectare (35-acre) SSSI, notified in 1981, is located within the community of Trellech United, on the banks of the River Wye, 3 miles (4.8 km) south-east of the town of Monmouth.

[2][3] The wood is jointly owned and managed by Gwent Wildlife Trust and the Forestry Commission.

[4] As with other woodland in the Wye Valley Area of Outstanding Natural Beauty, Graig Wood contains many local and rare tree species.

The predominant species within the wood are ash (Fraxinus excelsior) and wych elm (Ulmus glabra), although other species present include black alder (Alnus glutinosa), common beech (Fagus sylvatica) and small-leaved lime (Tilia cordata).